code: def test_load_not_from_mixin(self):
      with self.assertRaises(ValueError):
          ConfigMixin.load_config("dummy_path")
  
imports: import tempfile
  import unittest
  from diffusers import DDIMScheduler, DDPMScheduler, DPMSolverMultistepScheduler, EulerAncestralDiscreteScheduler, EulerDiscreteScheduler, PNDMScheduler, logging
  from diffusers.configuration_utils import ConfigMixin, register_to_config
  from diffusers.utils.testing_utils import CaptureLogger
label_desc: Use image node_id 1 for calling the ConfigTester obj's underlying member method code with example usage: obj.test_load_not_from_mixin() without return types